Color and Its Applications

Color and Its Applications

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...cell, the photo-electric cell is too erratic at the present time to be adopted as a means of photometering lights of different colors. The strengths of the electronic currents measured by means of a sensitive electrometer or galvanometer afford a measure of the relative intensities of the illumination of a given spectral character when the characteristics of the cell are shown; that is, when the relation between the intensity of illumination and the photo-electric effect is known. Lights differing in spectral character cannot be compared by means of the photo-electric cell unless a correcting filter is used after the manner necessary with the selenium cell. The photographic plate affords another possible method for the photometry of lights of different color, but its general adoption is discouraged, owing to lack of uniformity of the emulsion both as to thickness and sensibility. Some of the difficulty could be obviated by using plates made of plate glass. The panchromatic plates must be used, because the ordinary plate is not appreciably sensitive to rays of longer wave-length than 0.48/z, the maximum of sensibility being in the extreme violet region of the spectrum. The relative sensibility of a certain commercial panchromatic plate, for equal amounts of energy of various wave-lengths, is shown in Fig. 90 compared with the spectral sensibility of the eye. In order to make the plate record the values of colored brightnesses as determined with a flicker photometer, an accurate filter was made which consisted of aesculine, tartrazine, rhodamine, naphthal green, and glass three-eighths of an inch thick. How nearly this filter performs its intended purpose is shown in Fig. 91 by the circles in comparison with the luminosity curve of the eye which more

Product details

  • Paperback | 106 pages
  • 189 x 246 x 6mm | 204g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236611608
  • 9781236611604